<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			body{
				margin: 0;
			}
		</style>
	</head>
	<body>
		<!-- 绝对单位 -->
		<div class="" style="background-color: #0000FF;width:100%;height: 200px;">
			
		</div>
	</body>
</html>
